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Design of the control set in the framework of variational data assimilation. (English) Zbl 1375.93072
Summary: Solving data assimilation problems under uncertainty in basic model parameters and in source terms may require a careful design of the control set. The task is to avoid such combinations of the control variables which may either lead to ill-posedness of the control problem formulation or compromise the robustness of the solution procedure. We suggest a method for quantifying the performance of a control set which is formed as a subset of the full set of uncertainty-bearing model inputs. Based on this quantity one can decide if the chosen ‘safe’ control set is sufficient in terms of the prediction accuracy. Technically, the method presents a certain generalization of the ‘variational’ uncertainty quantification method for observed systems. It is implemented as a matrix-free method, thus allowing high-dimensional applications. Moreover, if the automatic differentiation is utilized for computing the tangent linear and adjoint mappings, then it could be applied to any multi-input ‘black-box’ system. As application example we consider the full Saint-Venant hydraulic network model SIC\(^{2}\), which describes the flow dynamics in river and canal networks. The developed methodology seem useful in the context of the future SWOT satellite mission, which will provide observations of river systems the properties of which are known with quite a limited precision.

MSC:
93C41 Control/observation systems with incomplete information
65D25 Numerical differentiation
Software:
SICC; TAPENADE
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